Abstract
The recent discovery of super-Earths (masses ≤10 M⊕) has initiated a discussion about conditions for habitable worlds. Among these is the mode of convection, which influences a planet's thermal evolution and surface conditions. On Earth, plate tectonics has been proposed as a necessary condition for life. Here we show that super-Earths will also have plate tectonics. We demonstrate that as planetary mass increases, the shear stress available to overcome resistance to plate motion increases while the plate thickness decreases, thereby enhancing plate weakness. These effects contribute favorably to the subduction of the lithosphere, an essential component of plate tectonics. Moreover, uncertainties in achieving plate tectonics in the 1 M⊕ regime disappear as mass increases: super-Earths, even if dry, will exhibit plate tectonic behavior.
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References
- Becker, T. W., & O'Connell, R. J. 2001, Geochem. Geophys. Geosyst., 2, 12
- Davies, G. F. 1993, Lithos, 30, 281
- Halevy, I., Zuber, M. T., & Schrag, D. P. 2007, LPI Contrib., 1138, 1173
- Hynes, A. 2005, Int. Geol. Rev., 47, 938
- Ida, S., & Lin, D. 2004, ApJ, 604, 388
- Jellinek, M., O'Neill, C., & Lenardic, A. 2005, AGU Abstr. Fall, P33A-0230
- Kasting, J. F. 1996, Ap&SS, 241, 3
- McDonough, W., & Sun, S.-S. 1995, Chem. Geol., 120, 223
- O'Connell, R. J., & Hager, B. 1980, in Physics of the Earth's Interior, ed. A. M. Dziewonski & E. Boschi (North Holland: Elsevier), 270
- Rivera, E. J., et al. 2005, ApJ, 634, 625
- Sleep, N. H. 1992, Canadian J. Earth Sci., 29, 2066
- Valencia, D., Sasselov, D. D., & O'Connell, R. J. 2007, ApJ, 665, 1413
Citations
-
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Abiotic O2 Levels on Planets around F, G, K, and M Stars: Effects of Lightning-produced Catalysts in Eliminating Oxygen False Positives
C. E. Harman et al. 2018 The Astrophysical Journal 866 56 -
Habitability from Tidally Induced Tectonics
Diana Valencia et al. 2018 The Astrophysical Journal 857 106 -
The fine structure constant and habitable planets
McCullen Sandora 2016 Journal of Cosmology and Astroparticle Physics 2016 048 -
Effect of Surface-mantle Water Exchange Parameterizations on Exoplanet Ocean Depths
Thaddeus D. Komacek and Dorian S. Abbot 2016 The Astrophysical Journal 832 54 -
Limit Cycles Can Reduce the Width of the Habitable Zone
Jacob Haqq-Misra et al. 2016 The Astrophysical Journal 827 120 -
Emerging Possibilities and Insuperable Limitations of Exogeophysics: The Example of Plate Tectonics
Vlada Stamenković and Sara Seager 2016 The Astrophysical Journal 825 78 -
Evolutionary Climate Tracks of Earth-like Planets
S. Kadoya and E. Tajika 2015 The Astrophysical Journal Letters 815 L7 -
The Role of Plate Tectonic-Climate Coupling and Exposed Land Area in the Development of Habitable Climates on Rocky Planets
Bradford J. Foley 2015 The Astrophysical Journal 812 36 -
Thorium Abundances in Solar Twins and Analogs: Implications for the Habitability of Extrasolar Planetary Systems
Cayman T. Unterborn et al. 2015 The Astrophysical Journal 806 139 -
The Persistence of Oceans On Earth-like Planets: Insights from the Deep-water Cycle
Laura Schaefer and Dimitar Sasselov 2015 The Astrophysical Journal 801 40 -
A Pilot Search for Evidence of Extrasolar Earth-analog Plate Tectonics
M. Jura et al. 2014 The Astrophysical Journal Letters 791 L29 -
On the Vigor of Mantle Convection in Super-Earths
Takehiro Miyagoshi et al. 2014 The Astrophysical Journal Letters 780 L8 -
The Role of Carbon in Extrasolar Planetary Geodynamics and Habitability
Cayman T. Unterborn et al. 2014 The Astrophysical Journal 793 124 -
Structure and Dynamics of Cold Water Super-Earths: The Case of Occluded CH4 and Its Outgassing
A. Levi et al. 2014 The Astrophysical Journal 792 125 -
Thermal-Orbital Coupled Tidal Heating and Habitability of Martian-sized Extrasolar Planets around M Stars
D. Shoji and K. Kurita 2014 The Astrophysical Journal 789 3 -
Water Cycling between Ocean and Mantle: Super-Earths Need Not Be Waterworlds
Nicolas B. Cowan and Dorian S. Abbot 2014 The Astrophysical Journal 781 27 -
Water Loss from Terrestrial Planets with CO2-rich Atmospheres
R. D. Wordsworth and R. T. Pierrehumbert 2013 The Astrophysical Journal 778 154 -
A Possible Carbon-rich Interior in Super-Earth 55 Cancri e
Nikku Madhusudhan et al. 2012 The Astrophysical Journal Letters 759 L40 -
Low Mg/Si Planetary Host Stars and Their Mg-depleted Terrestrial Planets
Jade C. Carter-Bond et al. 2012 The Astrophysical Journal Letters 747 L2 -
The Compositional Diversity of Extrasolar Terrestrial Planets. II. Migration Simulations
Jade C. Carter-Bond et al. 2012 The Astrophysical Journal 760 44 -
On the Notion of Well-defined Tectonic Regimes for Terrestrial Planets in this Solar System and Others
A. Lenardic and J. W. Crowley 2012 The Astrophysical Journal 755 132 -
The Influence of Pressure-dependent Viscosity on the Thermal Evolution of Super-Earths
Vlada Stamenković et al. 2012 The Astrophysical Journal 748 41 -
Model Spectra of the First Potentially Habitable Super-Earth—Gl581d
Lisa Kaltenegger et al. 2011 The Astrophysical Journal 733 35 -
Thermal Evolution and Lifetime of Intrinsic Magnetic Fields of Super-Earths in Habitable Zones
C. Tachinami et al. 2011 The Astrophysical Journal 726 70 -
On the Likelihood of Plate Tectonics on Super-Earths: Does Size Matter?
Jun Korenaga 2010 The Astrophysical Journal Letters 725 L43 -
Detecting Volcanism on Extrasolar Planets
L. Kaltenegger et al. 2010 The Astronomical Journal 140 1370 -
The physical properties of extra-solar planets
I Baraffe et al 2010 Reports on Progress in Physics 73 016901 -
Thermodynamic Limits on Magnetodynamos in Rocky Exoplanets
Eric Gaidos et al. 2010 The Astrophysical Journal 718 596 -
The Compositional Diversity of Extrasolar Terrestrial Planets. I. In Situ Simulations
Jade C. Bond et al. 2010 The Astrophysical Journal 715 1050 -
The Interior Dynamics of Water Planets
Roger Fu et al. 2010 The Astrophysical Journal 708 1326 -
Detecting Planetary Geochemical Cycles on Exoplanets: Atmospheric Signatures and the Case of SO2
L. Kaltenegger and D. Sasselov 2010 The Astrophysical Journal 708 1162 -
Geodynamics and Rate of Volcanism on Massive Earth-like Planets
E. S. Kite et al. 2009 The Astrophysical Journal 700 1732 -
Tidal Heating of Extrasolar Planets
Brian Jackson et al. 2008 The Astrophysical Journal 681 1631